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Undersampling Reference Receiver for LNA Distortions Compensation Direct RF Digitization Receiver

Vu, N.-A. and Tran, T.-H.-T. and Le, H.-N. and Nguyen, H.D. and Trinh, Q.-K. (2020) Undersampling Reference Receiver for LNA Distortions Compensation Direct RF Digitization Receiver. In: 22nd International Conference on Digital Signal Processing and its Applications, DSPA 2020, 25 March 2020 through 27 March 2020.

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Abstract

The paper analyzes the effect of the nonlinear distortion of Low Noise Amplifier (LNA) in multichannel direct RF digitization receivers (DRF-RX). A novel distortion compensation approach has been proposed, where the compensation is performed entirely in the digital domain at baseband after the digital down-converter (DDC). Distortion information is extracted from the signals of the main receiver and a linear reference receiver. The reproduced information is used for distortion compensation using a nonlinear model and an adaptive Least Mean Square (LMS) algorithm. As the major advantage, processing at baseband with a low sampling rate significantly reduces the cost, the design complexity and the energy consumption of the receiver. The proposed undersampling reference receiver structure exhibits additional benefit in terms of hardware usage and energy consumption by using a low-cost and large dynamic range ADC. To verify the scheme's efficiency, an Ultra High Frequency (UHF) DRX with four QPSK channels is simulated by Matlab Simulink. The simulation results show that the method improves the Spurious-free dynamic range (SFDR) with an increase of about 20 dB, compared to the results of RX without distortion compensation. © 2020 IEEE.

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculties > Faculty of Radio-Electronic Engineering
Identification Number: 10.1109/DSPA48919.2020.9213283
Uncontrolled Keywords: Digital signal processing; Distortion (waves); Energy utilization; MATLAB; Design complexity; Digital down converter; Distortion compensation; Least mean square algorithms; MATLAB/ SIMULINK; Receiver structure; Spurious free dynamic range; Ultra-high frequency; Low noise amplifiers
Additional Information: Conference code: 163760. Language of original document: English.
URI: http://eprints.lqdtu.edu.vn/id/eprint/9049

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